- expatiate (v.)
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[expatiate 词源字典] - 1530s, "walk about, roam freely," from Latin expatiatus/exspatiatus, past participle of expatiari/exspatiari "wander, digress, wander from the way; spread, extend," from ex- "out" (see ex-) + spatiari "to walk, spread out," from spatium (see space (n.)). Meaning "talk or write at length" is 1610s. Related: Expatiated; expatiating.
[expatiate etymology, expatiate origin, 英语词源]